You know the sound flavor from this particular combo of my gears never eases to amaze me as I listen to my music everyday. I have tried all the possible combos given the gears in my possession and this one is just different and stands out clearly. When the music doesn't sound as good as I want, I know the problem is with the recording. The diy thingy is fun and I am just getting into it. The K film caps are great as they sound even better with time.

Haha, yes, I enjoy them, I don't think they're perfect, (what is?) and probably a little expensive at their full retail price. I've heard other earphones with higher detailing and separation, air, speed. I've written a few things here why they have won me over though. Not to say W4 are bad at any of these above mentioned areas, they kind of meet in the middle with a dose of everything. I think in one sentence: I would say W4 allow me to stop critically analyzing music and listen to albums instead without losing any technical area in specific

I haven't heard the UM3X, unfortunately.
Haha, yes, I enjoy them, I don't think they're perfect, (what is?) and probably a little expensive at their full retail price. I've heard other earphones with higher detailing and separation, air, speed. I've written a few things here why they have won me over though. Not to say W4 are bad at any of these above mentioned areas, they kind of meet in the middle with a dose of everything. I think in one sentence: I would say W4 allow me to stop critically analyzing music and listen to albums instead without losing any technical area in specific

They both are good. The um3x more on the mids (more forward and thicker) and bass (more quantity but still in control). The w4(r) is more balance across spectrum. More neutral. And has more treble to um3x so thats why for the clarity goes to w4r. I would not say either of those is a bright iem. But w4 is brighter than um3x. Music separation and detailing also good on both iems. If u prefer a darker soundsig...um3x should be fit better.